<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>IFE task 29</title>
    <link rel="stylesheet" href="css/style.css">
</head>
<body>

<form class="form" id="form">
    <label class="lable">名称</label>
    <input id="ipt" class="ipt">
    <button type="button" id="btn" class="btn">验证</button>
    <span class="default" id="tip">必填，长度为4～16个字符</span>
</form>


<script src="js/app.js"></script>
</body>
</html>